NDLI: Cyclic delay diversity with linear precoding technique adopted in OFDM systems

Content Provider	IEEE Xplore Digital Library
Author	Bing Hui KyungHi Chang
Copyright Year	2009
Description	Author affiliation: The Graduate School of Information Technology & Telecommunications, Inha University, Incheon, Korea (Bing Hui; KyungHi Chang)
Abstract	Cyclic delay diversity (CDD) is considered a simple approach to exploit the frequency diversity, to improve the system performance in orthogonal frequency division multiplexing (OFDM) systems. Also, the linear precoding technique can significantly improve the performance of communication systems by exploiting the channel state information (CSI). In order to achieve enhanced performance, we propose applying linear precoding to the conventional CDD-OFDM transmit diversity schemes over Rayleigh fading channels. The proposed scheme works effectively with the accurate CSI in time-division-duplex (TDD) OFDM systems with CDD, where the reciprocity is assumed instead of channel state feedback. For a bit error rate (BER) of $10^{−4}$ and the mobility of 3 km/h, simulation results show that a gain of 6 dB is achieved by the proposed scheme over both flat fading and Pedestrian A (Ped A) channels, compared to the conventional CDD-OFDM system. On the other hand, for a mobility of 120 km/h, a gain of 2.7 dB and 3.8 dB is achieved in flat fading and Vehicular A (Veh A) channels, respectively.
Starting Page	487
Ending Page	492
File Size	3296480
Page Count	6
File Format	PDF
ISBN	9788955191387
ISSN	17389445
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-02-15
Publisher Place	South Korea
Access Restriction	Subscribed
Rights Holder	Electronics and Telecommunications Research Institute
Subject Keyword	Delay lines OFDM Fading Bit error rate Gain Delay systems Frequency diversity System performance Channel state information State feedback TDD Cyclic Delay Diversity Linear Precoding Reciprocity Frequency-Division-Duplex (FDD)
Content Type	Text
Resource Type	Article

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